Fitzgerald J. Archibald
Texas Instruments
An Automatic Gain Controller (AGC) for speech signals embedded in additive noise requires Voice Activity Detection (VAD) to avoid noise amplification, a peak level detector for computing gain, and a gain
controller for adjusting gain. This paper describes a low computational-intensive software AGC for use in
handheld devices. The AGC provides options for static and dynamic noise floor estimation in a VAD module.
The paper also describes analog and digital gain adjustment with gain curve selection to allow for distance perception during the AGC operation.
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